<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <label>
            <textarea placeholder="请输入要BB的内容(最多吐槽120字)" maxlength="120" v-model="msg"/>
        </label>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.index">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{(item.content ===''|| item.content === 'undefined')?'多弗朗辉哥': item.content}}
                </div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
    import {Toast} from 'mint-ui';
    export default {
        name: "comment",
        data(){
            return{
               pageIndex:1,  //默认展示第一页数据
               comments:[], // 所有的评论数据
                msg:''      //评论输入的内容
            }
        },
        created() {
            this.getComments();
        },
        methods:{
            getComments(){ //获取评论
                this.$http.get("api/getcomments/"+this.id+"?pageindex="+this.pageIndex).then( result =>{
                        if(result.body.status===0){
                            //this.comments=result.body.message;
                            //每当获取新评论时，避免旧数据被清空
                            this.comments=this.comments.concat(result.body.message)
                        }else{
                            Toast('获取评论失败！');
                        }
                });
            },
            getMore(){ //加载更多
                this.pageIndex++;
                this.getComments();
            },
           postComment(){  //发表评论
                //校验是否为空
               if(this.msg.trim().length===0){
                   return Toast('评论内容不能为空!');
               }
                //参数1.请求的URL地址
               //参数2.提交服务器的数据对象{content:this.msg}
               //参数3.定义提交时候，表单数据的形式{ emulateJSON:true }
                this.$http.post('api/postcomment/'+this.id,{ content:this.msg.trim()}).then(function (result) {
                        if(result.body.status===0){
                            //1.拼接出一个评论对象
                            var cmt = {
                                user_name:'匿名用户',
                                add_time:Date.now(),
                                content:this.msg.trim()
                            };
                            this.comments.unshift(cmt);
                            this.msg='';
                        }else {
                            Toast('发表评论失败');
                        }
                });

            }
        },
        props:["id"]
    }
</script>

<style lang="scss" scoped>
    .cmt-container{
        h3{
            font-size: 18px;
        }
        textarea{
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list{
            margin:5px 0;
            .cmt-item{
                font-size: 13px;
                .cmt-title{
                    line-height: 30px;
                    text-indent: 0.5em;
                    background-color:#C1C1C1;
                }
                .cmt-body{
                    line-height: 35px;
                    text-indent: 1.5em;
                    border-bottom: 1px solid #999;
                }
            }
        }
    }
</style>